You're looking for requirements regarding emergency power (generator) for elevators in a residential building. Let's break down where to look and what to consider

Relevant Codes:
NFPA 70 (National Electrical Code - NEC)

This is the primary code that governs electrical installations in the US.

IBC (International Building Code)

This code deals with building design and construction and often references the NEC for electrical systems.

Local Building Codes

Always check your local building codes, as they may have amendments or stricter requirements than the national codes. This is the most important step! Contact your local building department for clarification.

ASME A17.1/CSA B44 (Safety Code for Elevators and Escalators)

This standard governs the safety of elevators and escalators, but it might not directly specify emergency power requirements. It often defers to the NEC or IBC.

Where to Look in the NEC



Article 700 (Emergency Systems)

This is the primary article dealing with emergency power systems.

700.12 (Power Sources)

This section discusses acceptable power sources for emergency systems, including generators. Pay attention to requirements for automatic starting and transfer.

700.12(B)(6)

Elevator Car Lighting, Ventilation, and Communications Power. This section pertains to emergency power supply requirements when elevator cabs are left with occupants.

Article 701 (Legally Required Standby Systems)

This article addresses systems that are required by law or code to provide power during a power outage. Elevators sometimes fall under this category depending on their use and the building type.

Where to Look in the IBC



Chapter 27 (Electrical)

This chapter often references the NEC. Look for sections that specifically mention elevators and emergency power.

Chapter 10 (Means of Egress)

Depending on the elevator's role in egress (emergency evacuation), there might be requirements for emergency power. However, residential buildings typically do not use elevators for primary emergency egress.

Reasoning and Considerations



Residential Buildings and Egress

In residential buildings, elevators are generally

not considered part of the required means of egress. Stairwells are the primary means of evacuation during emergencies. Therefore, the requirement to have all elevators on emergency power is typically less stringent than in a high-rise office building or hospital. Accessibility Requirements

Even though elevators aren't primary egress, accessibility requirements might play a role. If the building has accessibility features (e.g., for people with disabilities) that heavily rely on elevators, there might be a stronger argument for having more than one elevator on emergency power.

Fire Service Access

Check if your fire department requires an elevator to be available for their use during an emergency. This is often a factor in taller buildings. If required, this elevator must have emergency power.

Local Amendments

Many jurisdictions amend the IBC and NEC. Your local building codes might have specific requirements for elevators in residential buildings that are more stringent than the national codes.

How to Find the Specific Code Requirement


Start with Your Local Building Codes

This is the most important step. Contact your local building department or building official and ask them for the specific code requirements regarding emergency power for elevators in a residential building. They can point you to the exact sections of the code.2.

IBC and NEC Research

If your local codes adopt the IBC and NEC, review the sections mentioned above. Look for specific language that addresses elevators in residential occupancies. Pay close attention to any exceptions or allowances.3.

Code Consultant

If you're still unsure, consider hiring a code consultant or electrical engineer who specializes in building codes. They can provide expert guidance and help you navigate the complex code requirements.

Why Only One Elevator Might Be Sufficient (In Some Cases)



Stairwells as Primary Egress

As mentioned, stairwells are the primary means of egress in most residential buildings.

Cost Considerations

Providing emergency power for multiple elevators can be expensive.

Generator Sizing

Reducing the number of elevators on emergency power can significantly reduce the size and cost of the generator.

Code Flexibility

Building codes often provide some flexibility based on the specific characteristics of the building and its occupancy.

Important Disclaimer: I am an AI chatbot and cannot provide legal or engineering advice. Code requirements vary significantly by jurisdiction. You must consult with qualified professionals (electrical engineer, code consultant, building official) to determine the specific requirements for your project. Flag for review